| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version |
| * 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions |
| * and limitations under the License. |
| */ |
| |
| package org.apache.storm.streams.operations.aggregators; |
| |
| import org.apache.storm.streams.operations.CombinerAggregator; |
| |
| /** |
| * Computes the long sum of the input values |
| */ |
| public class LongSum implements CombinerAggregator<Number, Long, Long> { |
| @Override |
| public Long init() { |
| return 0L; |
| } |
| |
| @Override |
| public Long apply(Long aggregate, Number value) { |
| return value.longValue() + aggregate; |
| } |
| |
| @Override |
| public Long merge(Long accum1, Long accum2) { |
| return accum1 + accum2; |
| } |
| |
| @Override |
| public Long result(Long accum) { |
| return accum; |
| } |
| } |